若n为正整数,则(-5)n+1÷[5(-5)n]=( )A.5n+1B.0C.-5n+1D.-1
题型:单选题难度:简单来源:不详
若n为正整数,则(-5)n+1÷[5(-5)n]=( ) |
答案
(-5)n+1÷[5(-5)n], =(-5)n•(-5)÷[5(-5)n], =-1. 故选D. |
举一反三
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